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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137cfd5b2409c6aec7e2ed0cc48dd6075cf7cd9cbb69b83264877d3c54cf8db7' 
  AND token = '1K4lHqVJivOO1hgaIQOQS5Amh97eY5JcD+KVS1MVv04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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