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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b276f68aae12d299c3aa550331d23a20e79f180559dbb60d5b2142ee55df601' 
  AND token = 'djCAb2nodEgrRMXkIg8uOqvM2fEJMnXfY3Y6GhHupKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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