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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8255d957255f28f4cab7a6def247d7e96a4477e06007afe13cbb1b1222dde72b' 
  AND token = 'eChbWlCPvMntRqXT7+kPMc36IB5Fa+VO/1gVmCIkefI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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