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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8cffa2f273920eb0d694486075e52b5cef9a6a8d4c7538d024e74cafc8fb5f4' 
  AND token = 'j0U8PAOzSEWNicAKYR8Xi8feLnI2vD7Nx8MX1jPFOBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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