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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67732879865c8a801efb12b52c535e5e58e64bea05374ac5862688bebb61246' 
  AND token = 'lHi2971g4Ssku3NBUtccN+hdv6VzV6mJC765dH1U0D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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