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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76a143b3e1666399c138bd4b2ef41efc1b79f88c329a060d1931f8d14dd10bc' 
  AND token = '15WFb7WqP4edwDcFBmFSLbVDjqehwsyDvXoxuk4MRAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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