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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f726798d2ea95e7d999d9e40d9c452000cd3db2dc9842789b8e6db18d870587c' 
  AND token = 'YKcdQ710BtVvIR3KTeK5KhbaXM0WipxzKZHJlu59idY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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