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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89a475e67b9f9eb6ad959e20e339ff6c5e50077fa744ffadc28357b5659a1e9' 
  AND token = 'CfAJyU5EOs5XmfH4woEmrK/d0lwON71TVQuPTmFAIfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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