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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fb4041937d45fb5249da2a8f6e120c8fe62488e3d48eac336b58f449e11a25' 
  AND token = 'fX79C5CBzU9NJCUI773hfEE59Vzx7hbjwm+m6cfvnZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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