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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45941ad56428ed5dc5c6589eb65c7bf2970e2bc1a6a8a111aac96c4b5170955' 
  AND token = 'NLUzgMDVP/03H4L3VW5Lk3Do45VrQejqJBs36dUQC7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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