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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef35001a07a91ff4d0b3e2d8a3fa9755f33381429fbf72ff954a0613312caf5d' 
  AND token = '39TJlew6/wphxldi5MP5fqdQafDEg8cCgKutVNb7u9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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