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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e7ae1a52f5aac3d67ebc9a156f3a46b087c0912bedeecdd231105f0d4b860f' 
  AND token = 'b3Kt3V0iB3YCwM8Ysa0659qWKB6hEy7kVdSLl976l/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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