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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc9bd40e75ab1091f9339d03e31dadb97616404b1552af46cfd99f7a67e998f' 
  AND token = 'Vn6Vv955UPO8KOZOOvumHUinCHtZ+N1xSvtlG2sF/U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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