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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17523361c83a54ef4970a853002c8e80ad31986ffe48b9f2af928d5348a69f3a' 
  AND token = 'W4gPjydveTPK7lBrhh+LZN2ae2MKsc15Ll0dkkYdjpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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