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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab5d4db0d5388aa92e3d7399c258a771ece60d79ca46902b60d20fbe6fbd19d' 
  AND token = 'sM0xFn6bdGydCL0wWfA+a0oM7Re3C8QsnznwgWyqQLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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