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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b714d641f84ec88159d8f4ba328dc5c2bdeabd91acc87793d39fb00d1b2110' 
  AND token = 'J1epsE0wAIwmYCVmCzk7i0qngo5mRJq3wDMs9DFYlbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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