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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713014735c2047ee5592a1029acf8dfe4cccfbdc54720ff733032138c7f801c1' 
  AND token = 'vTZdYGQ/98zgTRdRHQKSqJL7z7dyM8UL5xab/UZxHuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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