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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa14a4ebf0ab0361231df711cc0ca535d04b081c3dffa73c371f467760f5238' 
  AND token = 'jwIN0dihVtO0pHX1anE3PDyiMZBkkm5HhUc+GWvnRmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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