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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71605efb9709e19fb187cf5e8f0d855671c9066b32886e99656a171c1e3d7fa' 
  AND token = 'gUUNOfiwnNC6EkThcEZ0I+396/xj1Uo8LbHruCq+UHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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