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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '256b4feec3945e46ec7e41e87555ec1bd376559098e601cf21bdbb55e6d5ba8d' 
  AND token = 'ggEbmd4qRIFvaOfz/MhP+juoj3vgrYb93stGffNEq/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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