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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70a48f1d55d0fae0c580bbe7ac3249e36e0e6157adfd7fec3d227ca9fd49dc8' 
  AND token = 'R67TeOQ1M+Kx5oBuzTaook9w0r9PuwVP+RA7JzrPOMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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