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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ed294c0d97a38190101c3cc43055e6669be538ee12e6f92d662501d86c3932' 
  AND token = '/zAHvii6aC3zu9lgWK4F7Tv4aonfvw95IoUDnfVW91k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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