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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8b99d32d0f89a1a7feb9a941414d979ea9b69c64116088586f79f162e70097' 
  AND token = '8bGr/qZIyh6ja10B91rlyI3e0EUY/Sm1uytC4GEvDN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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