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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0920b972d560c3bfb77c2ccaadc85b497abfb4417f4f20cfc9dec57cda06d42a' 
  AND token = 'SYMdcIGPMHiEd6NchtFGPnc4umi0x4TSC6uprAhCabQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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