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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2085c44d62096e4e2959f3b8bd05213843328b0bda69a04120b261620e14a3' 
  AND token = 'rYLrnJCA0/cgnVmEU22ce/xzxnpc4sy9eO5f2zQk6S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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