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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d61ae206310d797d639d2121b4ab0d555de9990f2b249e3b50b7fff74b47ce' 
  AND token = 'c3yUZRGR+RmjYptjuzd1vr8VsVLAbTg0aToqmfMEEdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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