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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc6de25440c47426599a07c6a6f519b3698733c518cec545e236bba7946ac5a' 
  AND token = 'dElBZfGaFnhVCmcMqvDWDD3GfzsDCpht/09m1L0li2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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