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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c674a56f11e392e8dc1471f82adb6536254c8f2daf021b4eab1d8db6d22182d1' 
  AND token = 'yO9sj4uRso0082z2ueUaW/lK3SoA8OLTvDYGkZF8340=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}