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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432f693f36667add305293b768b5084c7aa0b7bec04a32739772e80b99e5bf93' 
  AND token = '/4tMKoaaT6LTp+ZLc2yGveJ5Sjn0d5U0NdmQBQgMeyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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