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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdf620d0565079f3074129876a5968ba8bbcfe5344bd60a66d9eacb2e5ec4c5' 
  AND token = 'DInuimf5Ox/L5JIrfReL9Tc9zzk7C7P6HockSP+2UQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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