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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e006d7909cc97eec90021904326a3f2673fb1d926787f4b74d159c6f1f33ba' 
  AND token = 'rshBxg743B7huAn2maMa+Z0NvfZ7xBEXi+AFy5lbk90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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