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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616629398662cb585f4b2cf9687dc12458752eee3d089a19110d9890422a9f5c' 
  AND token = '3ryiWK1Fb860oNjhPCpVRq8zbI6asgwwYRrKVP3RCCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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