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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef12c4e58a78b6b325ef4af884732c3e75998f4c4fd75179df760956dc94bf5' 
  AND token = 'cGPSEWCB6LETbxfw0o2zvNNFKFjz9fYC4rwJEh28Ics=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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