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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde43a4055a555f0581bc30d2dd647f6868d27f2c5dd72c4782f3fdc5ea5f043' 
  AND token = '8J0Qw1K3fb0JCn95xQJ729hcKvyRFgoPR+8isM03N04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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