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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b420623727d3763a9bd0e4555e38fa49860bfffc9dcc6547906b7c9c25a49a99' 
  AND token = 'dCdJruleiyLetSBE4NHFFfxeEyPm9gQPPRMis+NcnUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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