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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fa1263cf38551cea4602174dd52f59451f179bde78841b77f57e8e4882e2db' 
  AND token = '1u1tFdNDqbqsT6bxvngmOgyvqX+QFgWixWcJcnJzcSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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