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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6299caaf9c116f164a5750d80b0c8e57c2934650220f7d3e070be6d9bacb0a3' 
  AND token = 'bg9Oz7RFxQajWfKBuMw5DsY7mMpw8mhFE0FZSkeVDV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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