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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d825bab2fec7cb4de537c70bf9b82aaaac62c1c0b4fbe300d39a1773c1efea' 
  AND token = 'NV0zKn+1bgDXmMNHS4xxUjh3cc+g2DT3+HMM1e6k03M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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