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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3157e7607ffc1b9a058771a2deff841f0e84092fcad33721e5fa7a2cad31af' 
  AND token = 'Prkzc00FaHtnXfCooaUo+U9xwTU28nbqNYA91c7UiiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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