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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20ef38b05c06a5df7c41b380f20bb9cc91c2e7b88a74c3177120f5d51a7befd' 
  AND token = 'jlVxUkIfoKimW1IN3QRd4T+ZsY5ko+3gcg5M8cdfavI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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