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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d3f557e58099e2b10c3768aabcfa6e835602f15b78fb648a10af122c2d3013' 
  AND token = 'SkuDkOA2dCfmNQFV+GmQmyxfVg1hbJ/k14C9H3kOIVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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