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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d9d74b559ec2deb71a22e51bafe626075407489dc7848b15756e869d16d28e' 
  AND token = 'n6xogFobe9rkV/Q4GJwvs+LzzNGsxZwhFpGOSfASRck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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