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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca6337b5f7ae1355c7edb9b7da8fbf01c31fb847fa3e2a686efa83ab4eb6ae6' 
  AND token = '8uW41n4a4UqhIY2qkjZBT/cNF9y0eSGJIgSNhzAkNsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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