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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3626893f5b993524957f16fbe49b2a5e53a2e551ae70131530e0c415850d07c5' 
  AND token = 'WhsvaZRAWr0TOMS3na/3RbeLtCtsfPmDh0i+qjculRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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