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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705b27c5e06f424a6cb5757d1c3a34b36a76135a2a7f49ea41e8d5540ed3e206' 
  AND token = '7W2R/q9Y2nqeb+8tl23jfC8pjxiPzpRP2pYXiYVHv2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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