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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e07a880693b77d6f247528fc6dd71adad6b70dee19bd0650d018c1119fe039' 
  AND token = 'tP5WA74mNS0mpaW14DXg+2mcJor3q2XAcUV8H2m0Dd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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