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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '988752edf0931aaf6ca02e14072321ec607a5e0eb721b05afbec592aeedf6ddf' 
  AND token = 'yzkO3GOnvmXi+dH/WrXN1Q6b7FnbXslZAuDDByOWpX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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