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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6738c91ff57f549be541fa5f2e4eef4bb65837c5499982049edc18b30f2627d3' 
  AND token = 'jM+KKSziUvdRgXorwxk40io4iRNAU0VYmMDyM001BNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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