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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86761ab6822b1e0e5e1bac2712c3986d2b790d180b29cf299ea7ac0d074574e' 
  AND token = 'A79MGlxwOrfOFXkhSQ/8xRkM+vAa799WJAqvLebKHkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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