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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e012ae0f0c9381f174e402db3349894c6b56156eb347a9e589a5a4ec3e07eb' 
  AND token = 'hNYj99yphSKHiQxYQ6zyXWio2dWO8fpfisobl8ROCjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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