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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6daceb17b1c1e46ce47d6a1d1195dc4d0a95dd555f1bcc42ec0d9f551f28a17e' 
  AND token = '56hgjZolWDPGx/JDxc1RUJm0dThvUhz9zkg/Zf5foag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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