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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a117936811e79272c259f31b3fff9231a310f4c5f0cd8d6408a766ec0d020e' 
  AND token = 'faU8G6oEuuEvlf/aF/+uG1ZEFwuOEjp3mdNEouqarVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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