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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef699f1122e3c32bc029fb3ed6076e11eb4dc9f507c2d2fece32f2c4229d59e' 
  AND token = 'r+nlP6bjMCnM4eY91iYCVPscfqBlMTEN6xgJlUh9UV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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