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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08940dcc499e38879e8d48567bab5d35e5da119b20c1c9a946a54d5579327edf' 
  AND token = 'p/Ma8Kopl9kVFILUCHA0j0k6AQgayoA7+MYHkQ8eNqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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