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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c2a3eecb01bf9bc2036d78a755c9e6ef92e739cf159b48324900b3d3a7f1b9' 
  AND token = 'JRbNFGh3G1JE1ai40JQC9h6f1rgBnSj7t10ydeZrVyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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