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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7f813616d67bd12c437ddfad931e4fd735ade600ee39d7715260c9f61e4b41' 
  AND token = 'UWN/qkxc51Afl5i+HHFtfmDEhtjOkt33PJN8Dup6Ue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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