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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2685ba2a879d3c490f9e44745cc82c2c72c5a04f65f5eac39c2e05dba8a0a135' 
  AND token = '1VsSzwKC+LSheUat7nMO9mRRp8TjKj5pB55MwPH0OS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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