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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99d4162abab63a66b23b63214355fd03645797fe71bd61af77a73bd604269ac1' 
  AND token = 'QrI0Fn4U9tFTNznwYgJq21TDFhPjyhwBMw3Pj5wwM/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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