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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3d3c9f6c70dccd905c853500f7ab7794f7bcbf9f693061476cdc40267c686d' 
  AND token = '5utgjpnauClWTeKl70C8NfCCYx/kFa1K6s2tn+Ha1KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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