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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4a5aee662a2822251f0b1b5789f9c688d153326c92e9f0979e87269fca14bf' 
  AND token = 'XXRK8scvjL4DO8AsBuq+8jpflEiR1R66DZu6iLMXF2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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