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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2bf81c21424c128a37d3b8ffce491fc913e27377d3fa171c2fdfea75781c8af' 
  AND token = 'dxozhj7cvWPFbTQcy8Sh3n78BVZvCkuPQ+f2x8S+8F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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